JP3343076B2 - Wall panels and reinforced earth structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall panel for holding an embankment layer and a reinforcing soil structure comprising the wall panel.

[0002]

2. Description of the Related Art For example, FIG. 5 shows an example of a reinforced earth structure constructed by embankment. In the figure, a top of an embankment layer 20 formed by embankment while carefully rolling is placed along a slope. A plurality of wall panels 21 are installed adjacently in the vertical and horizontal directions.

[0003] In addition, connecting metal fittings 22 protrude from the rear surface of each wall panel 21, and each wall panel 21 is an embankment reinforcing material made of strip steel or the like embedded in the embankment layer 20 via the connecting metal fitting 22. 23 and is fixed to the tip of the embankment layer 20.

[0004]

However, the wall panel 2
1 is usually formed from a rigid material such as concrete, while the embankment forming the embankment layer 20 is formed of a granular material, and is easily compressed and easily deformed during rolling. At the time of compaction of the embankment layer 20, causing a relative displacement, which was greatly affected by the movement of the surrounding soil particles, and eventually broke.

[0005] It is extremely economical and desirable to use the locally generated material as the embankment. However, if the embankment is inferior, there is a problem that the wall surface is easily displaced due to high compressibility.

Further, the concrete panel of the reinforced soil retaining wall is generally 18 cm to 22 cm thick, so that it requires a large amount of material and is uneconomical. There was a problem that workability at the time was poor.

[0007] In order to solve the problem of using the embankment with high compressibility among the above-mentioned problems, there is known a method of connecting a concrete panel and an embankment reinforcing material via a slide joint.

The method using this slide joint is as follows.
This is an excellent method because the connecting portion a adapts to the compression of the embankment, but since the position of the connecting portion a between the wall panel and the embankment reinforcing material changes in accordance with the compression of the embankment, the stress state is likely to change, and There is a problem that an unclear stress is generated in the portion a and deformation or the like is likely to occur.

Thus, as time passes, the connecting portion a
May change, and sometimes a complicated stress which is difficult to predict occurs, and the connecting portion a may be deformed.

Generally, the displacement of the wall surface in this type of reinforced soil structure is caused by the compression of the embankment layer 20 and the lateral expansion due to the compaction load, the change in the horizontality of the embankment reinforcing material accompanying the compression of the embankment, and the accompanying embankment. It is caused by reduction of pull-out resistance of the reinforcing material, concentration of stress at the connecting portion, extension of slack of the connecting portion a during rolling, deformation of the connecting portion a, and the like.

Furthermore, the wall surface is displaced by the deformation of the embankment reinforcing member 23 and the wall panel 21 due to the compression of the embankment layer 20 due to the overload, and also by the concentration of stress on the connecting portion a.

Heretofore, in order to cope with such unclear stress changes, the thickness of the wall panel has been increased, the connecting portion having a slide joint function has been increased, or the members have been increased in thickness. It was necessary to maintain sex.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By using a thin concrete panel having a sliding function as a wall panel, a large force acts on the embankment reinforcing material and the compressibility is improved. It is an object of the present invention to provide a wall panel and a reinforcing soil structure which are less likely to be deformed or broken even when the connecting portion of the embankment reinforcing material is displaced by the use of the embankment, and which are excellent in workability and economic efficiency.

[0014]

According to a first aspect of the present invention, there is provided a wall panel which is installed adjacent to a top end of an embankment layer vertically and horizontally along a slope of the embankment layer. It has a plate-like shape and has widening ribs protruding in a substantially trapezoidal shape when viewed from the front at both left and right edges below the center thereof, and has a pair of left and right sides on the back side with respect to the vertical direction of the wall panel.
Nominal, parallel and continuous in the vertical direction of the wall panel
A reinforcing rib having a substantially trapezoidal cross section, and
The connecting metal fittings for connecting the soil reinforcement are above and below the wall panel
It is characterized by being projected symmetrically to the direction
It is.

[0015] The wall panel according to the second aspect is the first aspect.
On the wall panel, the connecting bracket is approximately U when viewed from directly above.
Anchors embedded in reinforcement ribs
Rate and anchor plate on this wall plate
Projecting from the back side of
A connecting plate with connecting holes formed in the vertical direction
It is characterized by consisting of.

The wall panel according to the third aspect is the same as the first aspect.
Or the wall panel described in 2 above, as a joint at the peripheral portion
It is characterized in that the determination is formed continuously in the circumferential direction
Is what you do.

According to a fourth aspect of the present invention, there is provided the reinforcing soil structure of the embankment layer.
Filling the wall panel according to claim 1, 2 or 3 at the tip
Multiple installations adjacent vertically and horizontally along the slope of the layer
And laying a plurality of embankment reinforcing materials in the embankment layer
And the end thereof is connected to the wall panel via a connecting bracket.
Is characterized by being connected to.

[0018]

1 to 3 show an embodiment of the present invention. In the drawings, an embankment made of a locally generated material or the like is carefully rolled to form an embankment layer 1, and the tip of the embankment layer 1 is formed. A plurality of wall panels 2 are installed vertically and horizontally adjacent to each other along the slope of the embankment layer 1.

The embankment reinforcing material 3 is laid in a plurality of layers in the embankment layer 1, and each embankment reinforcing material 3 is
And are connected to the wall panel 2 via the respective members.

The wall panel 2 is formed in a substantially rectangular plate shape, and wide-width ribs 2a, 2b,
2a are protruded respectively. Further, two reinforcing ribs 2b, 2b are formed continuously on the back side in parallel in the vertical direction.

The widening ribs 2a are formed below the center of the wall panel 2 in a substantially trapezoidal shape when viewed from the front. The reinforcing ribs 2b are formed slightly inward from both ends of the wall panel 2 in a substantially trapezoidal cross section or a substantially rectangular cross section.

As shown in FIG. 2 (b), the widening rib 2a preferably has a corner b projecting at an obtuse angle or a substantially arc shape. Thereby, even if the earth pressure applied to the left, right, upper and lower wall panels at the time of the compaction of the embankment varies, and even if the adjacent wall panels 2 are displaced on the vertical surface due to uneven settlement, etc. The corners b are less likely to break. In the conventional panel, since this portion had a right angle, the corner was sometimes broken. In particular, in the case of a thin panel, this destruction is a major problem in terms of stability.

Further, joints 2c and 2d are formed on the peripheral edge of the wall panel 2, respectively. The joint 2c is formed on the lower edge and one side edge, and the joint 2d is formed continuously on the upper edge and the other side edge in the circumferential direction.

The joints 2c and 2d are engaged when the wall panels 2 are installed adjacent to each other in the vertical and horizontal directions (see FIGS. 2 (d) and 2 (e)). A gap is provided between the panels 2 and 2 so that a certain range of mobility can be maintained to prevent concentration of stress, and the wall panel 2
Are formed to prevent displacement in the out-of-plane direction, and form a crossover.

This facilitates positioning of the wall panel 2 when the wall panel 2 is installed. In addition, when the embankment is compacted, a large earth pressure from the embankment layer 1 prevents a part of the embankment from flowing out from between the adjacent wall panels 2 and 2 or a displacement of the wall panel 2 in an out-of-plane direction. As a result, the wall surface can be reliably prevented and a stable wall surface can be obtained despite the thin wall panel.

A plurality of connecting fittings 4 are provided at predetermined intervals in the vertical direction on the back side of the reinforcing rib 2b. As shown in FIGS. 3A to 3C, the connection fitting 4 is formed in a substantially U-shape when viewed from directly above, and is buried in the reinforcing rib 2b in the concrete at predetermined intervals in the vertical direction. And two connecting plates 4b fixed to the projecting portions of the anchor plate 4a and projecting parallel to the rear side of the wall panel 2. The connection plate 4b is formed with connection holes 4c which are elongated in the vertical direction.

An anchor plate 4a having a U-shaped end.
Is particularly strong against withdrawal,
Since it can be fixed in concrete, it is effective to accurately, parallelly and firmly attach the two connecting plates 4b to the reinforcing ribs 2b.

The end of the embankment reinforcing material 3 is connected to the thus-formed connecting fitting 4 by a connecting bolt 5 penetrating through the connecting hole 4c.

As described above, the wall panel 2 according to the present invention is provided.
And the embankment reinforcing material 3 have a very simple structure and maintain the left-right symmetry. Therefore, even if the position of the embedding portion a changes in accordance with the compression of the embankment, the connection portion a An indefinite stress is less likely to be generated, and thus a strong structure is hardly generated in displacement or breakage of the wall surface.

Such an advantage is mainly due to the fact that the reinforcing ribs 2b are continuous in the vertical direction, and the connecting portions (connecting fittings 4) having a sliding function are projected from the reinforcing ribs 2b.

The embankment reinforcing material 3 includes a reinforcing bar, a steel strip, a reinforcing bar grid,
For those made of geotextile or the like, particularly those made of rebar, a connecting plate 3a is protruded at the end on the connecting metal fitting 4 side, and a bearing plate 6 is attached to the opposite end.

The connecting plate 3a has a connecting hole 3b through which the connecting bolt 5 can be inserted.

The embankment reinforcing material 3 made of reinforcing steel thus formed is inserted by connecting the connecting plate 3a between the connecting plates 4b and 4b of the connecting metal fitting 4, and by tightening the connecting bolts 5 into the connecting holes 4c and the connecting holes 3b. , Are connected to the rear surface of the wall panel 2 via the connection fittings 4.

In such a configuration, since each embankment reinforcing material 3 is connected to the particularly thick reinforcing rib 2b via the connection fitting 4, the embankment reinforcing material 3 is reduced to a large earth pressure when the embankment layer 1 is rolled. Again, it is possible to reliably resist.

Further, even if the embankment reinforcing member 3 sinks due to the settlement caused by the compression at the time of compaction or the sedimentation with time after the construction, the end of the embankment reinforcing member 3 is connected to the connection hole 4 c of the connection fitting 4.
By sliding downward along the wall panel 2
The stress does not concentrate on the connecting portion a between the embankment reinforcing material 3 and the embankment reinforcing material 3, so that the damage of the connecting portion a and the displacement of the wall panel 2 can be reliably prevented.

As a result, a very stable thin wall panel having a sliding function can be used, and a reinforced earth retaining wall excellent in workability and economy can be constructed.

Further, by adopting such a structure,
The panel thickness of the portion having the reinforcing ribs 2b could be reduced to 17 cm or less, and the thickness of the other portions could be reduced to 10 cm or less.

Next, the construction method will be briefly described with reference to FIG. First, the first-stage wall panel 2A is set, and the back side of the first-stage wall panel 2A is filled up to the position of the lower connection fitting 4A, and is carefully rolled to form the filling layer 1a. Next, the first-stage embankment reinforcing material 3 is placed on the embankment layer 1a.
A is laid. Then, the end of the embankment reinforcing material 3A is connected to the connection fitting 4A. At this time, the connection plate 3a of the embankment reinforcing material 3A is connected to the connection plates 4b, 4b of the connection fitting 4A.
The end portion of the embankment reinforcing material 3A is connected to the connection fitting 4A by inserting the embankment reinforcing material 3A into the space therebetween and tightening the connection bolt 5 in the connection holes 4c and 3c.

At this time, a turnbuckle 7 may be provided on the embankment reinforcing member 3 to adjust the verticality of the wall panel 2. Next, on the embankment reinforcing material 3A, the upper connecting metal 4
Fill up to position B, and carefully roll the fill layer 1
b is formed. Next, the second-stage embankment reinforcing material 3 is placed on the embankment layer 1b.
B is laid. Then, the end of the embankment reinforcing material 3B is connected to the connection fitting 4B.

In the same manner, the second and third stage wall panels 2B and 2C and the embankment reinforcing members 3B and 3C are alternately provided with the embankment to construct the entire reinforced earth structure.

During the construction, even if the embankment reinforcing material 3 sinks, particularly due to the compaction of the embankment, the end of the embankment reinforcing material 3 can slide downward along the connecting hole 4c of the connecting fitting 4, so that the wall panel can be slid. The stress does not concentrate on the connecting portion a between the embankment 2 and the embankment reinforcing material 3, and therefore the connecting portion a is not damaged and the wall panel 2 is not deformed.

[0042]

The wall panel according to the present invention has the above-described structure, and can be formed as thin as possible except for parts having reinforcing ribs, so that the production cost can be reduced by saving materials and the weight can be reduced. Workability can be improved.

Further, since the embankment reinforcing material is connected to the thickly formed reinforcing ribs via the connecting metal fittings (connecting portions), the embankment reinforcing material can be reliably and reliably applied to a large earth pressure during rolling of the embankment layer. Strongly resistant and extremely stable in strength.

The connecting fittings (connecting portions) having a sliding function are provided on a substantially rectangular plate-like panel so as to project right and left symmetrically and to reinforcing ribs provided continuously in the vertical direction, and Since the connection fitting (connection part) has a simple structure that is symmetrical to the left and right, even if the embankment reinforcing material moves along the long hole of the connection part, there is no indefinite change in stress, so the minimum A strong and stable wall surface can be formed by using a connection fitting having a size of.

Further, even if the embankment reinforcing material sinks due to the settlement due to the compression at the time of compaction or the sedimentation with time after the construction, the end of the embankment reinforcing material is formed along the vertically formed connection hole of the connection fitting. By sliding down, the stress does not concentrate on the connection between the wall panel and the embankment reinforcement, and therefore the connection between the wall panel and the embankment reinforcement is broken and the displacement of the wall panel is ensured. Can be prevented.

The wall panel is formed in a substantially rectangular shape, and widening ribs are provided on both right and left ends thereof. The widening ribs have an obtuse angle or a protruding arc shape so that the panel can be made thin. However, there is an effect that the corners are not broken.

Further, in the reinforcing soil structure according to the present invention, the wall panel itself is movable while maintaining the left and right spaces,
In addition, the present invention enables a strong reinforced soil structure that is less likely to break while allowing downward movement of the embankment reinforcing material of the connecting portion in accordance with the vertical compression of the embankment.

[Brief description of the drawings]

1A is a partial front view showing an example of a reinforced soil structure, and FIG. 1B is a longitudinal sectional view thereof.

2A is a plan view of a wall panel, FIG. 2B is a front view thereof, FIG. 2C is a side view thereof, and FIGS. 2D and 2E are respectively line II and II in FIG. FIG.

3A and 3B show a structure of a connecting portion between a wall panel and an embankment reinforcing material by a connecting metal, and FIGS.
(C) is a cross-sectional view thereof.

FIG. 4 is a partial vertical sectional view showing a construction method.

FIG. 5 is a perspective view showing a structure of a connecting portion between a conventional wall panel and an embankment reinforcing material.

[Explanation of symbols]

 Reference Signs List 1 embankment layer 2 wall panel 2a widening rib 2b reinforcing rib 2c joint 2d joint 3 embankment reinforcing material 3a connecting plate 3b connecting hole 4 connecting metal fitting 4a anchor plate 4b connecting plate 4c connecting hole 5 connecting bolt 6 supporting plate 7 turnbuckle

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuaki Fukuda 34-1, Kokuzaiji, Fukaya-shi, Saitama (72) Inventor Takeshi Ono 4-83-10-501, Narashinodai, Funabashi-shi, Chiba (72) Inventor Koji Ishishita 14-3-203, Aioimachi, Itabashi-ku, Tokyo (56) References JP-A-8-326074 (JP, A) JP-A-62-294620 (JP, A) JP-A-63-114722 (JP, A) A) Japanese Utility Model 7-23036 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 17/18

Claims (4)

(57) [Claims] 1. A wall panel installed at the tip of an embankment layer adjacent vertically and horizontally along the slope of the embankment layer, the wall panel has a substantially rectangular plate shape, and the left and right sides below a central portion thereof. Both edges have widening ribs projecting in a substantially trapezoidal shape when viewed from the front, and on the back side with respect to the vertical direction of the wall panel.
Symmetrical / parallel and vertically connected to the wall panel
A reinforcing rib having a substantially trapezoidal cross-section,
A connection fitting for connecting the embankment reinforcement to the wall panel
It is characterized by being symmetrically projected in the vertical direction.
Wall panel to do. 2. The connecting bracket is formed in a substantially U-shape when viewed from directly above, and has an anchor plate embedded in a reinforcing rib, and is fixed to the anchor plate and protrudes from a rear side of the wall panel. 2. The wall panel according to claim 1, wherein a connecting hole for connecting the embankment reinforcing material is formed of a connecting plate elongated in a vertical direction. 3. The wall panel according to claim 1, wherein the joints are formed in the peripheral portion as joints continuously in the circumferential direction. 4. A plurality of the wall panels according to claim 1, 2 or 3 are installed at the tip of the embankment layer adjacent vertically and horizontally along the slope of the embankment layer, and in the embankment layer. A reinforcing soil structure comprising a plurality of embankment reinforcing materials laid, and ends thereof connected to the wall panel via connecting metal fittings.